feat: add host-infra provider support

[shawnh2]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

ref #1393

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 32.79133% with 248 lines in your changes missing coverage. Please review.

Project coverage is 65.77%. Comparing base (544bd9c) to head (36a9f17). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/cmd/certgen.go	17.54%	37 Missing and 10 partials :warning:
internal/infrastructure/host/proxy_infra.go	14.28%	42 Missing :warning:
internal/infrastructure/host/infra.go	20.00%	33 Missing and 3 partials :warning:
internal/crypto/cert_load.go	0.00%	31 Missing :warning:
internal/infrastructure/manager.go	0.00%	19 Missing :warning:
internal/globalratelimit/runner/runner.go	0.00%	18 Missing :warning:
internal/xds/server/runner/runner.go	0.00%	18 Missing :warning:
internal/gatewayapi/runner/runner.go	36.00%	16 Missing :warning:
internal/infrastructure/common/proxy_args.go	84.21%	4 Missing and 2 partials :warning:
api/v1alpha1/envoygateway_helpers.go	33.33%	4 Missing :warning:
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4481      +/-   ##
==========================================
- Coverage   65.95%   65.77%   -0.18%     
==========================================
  Files         203      209       +6     
  Lines       31154    31352     +198     
==========================================
+ Hits        20547    20622      +75     
- Misses       9420     9533     +113     
- Partials     1187     1197      +10     

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[arkodg]

hey @shawnh2 when we write docs, we should probably highlight that standalone mode is still experimental and not meant for production yet, and not all features work out of the box (like global ratelimit)

[Xunzhuo]

@shawnh2 do we have built any e2e tests for host mode? and we need a user-facing docs for a quickstart and a little bit words about its scenarios

[shawnh2]

@shawnh2 do we have built any e2e tests for host mode? and we need a user-facing docs for a quickstart and a little bit words about its scenarios

will add user-facing doc & e2e test as a follow-up.

[zirain]

@shawnh2 please rebase to make CI happy.